scholarly journals V. The specific heat of water and the mechanical equivalent of the calorie at temperatures from 0° C. to 80° C

1912 ◽  
Vol 211 (471-483) ◽  
pp. 199-251 ◽  
Keyword(s):  
Physical Properties ◽  
Specific Heat ◽  
Early Stage ◽  
Pure Water ◽  
Large Body ◽  
Reasonable Time ◽  
Straight Line ◽  
Starting Point ◽  
Similar Series ◽  
Heat Curve

The work described in this paper started from the researches upon the properties of aqueous solutions, which have occupied one of us for some years past. In the course of this work it had been found that the measurement of various physical properties of solutions, including density, conductivity, and viscosity, at various temperatures and various concentrations, threw considerable light, not only on the constitution of solutions, hut upon that of water itself and upon the amounts of water combined with a solute at various temperatures and concentrations. It seemed probable that similar series of observations upon the specific heat of solutions over considerable ranges of concentration and temperature would throw further light upon these matters, and the apparatus described in this paper was therefore primarily designed for the observation of the specific heat of solutions with the desired degree of accuracy, and with the facility and ease of manipulation which are essential when it is required to amass a large body of data in a reasonable time. At an early stage it became apparent that the temperature-specific heat curve of water was entirely altered in character by the introduction of a small amount of solute. With a half-normal solution of KCI the more or less parabolic curve for water becomes nearly a straight line, and even with fairly dilute solutions the water curve is greatly modified. The appreciation of this modification necessarily involved as a starting-point the consideration of the curve for pure water, as to the form of which different observers have come to widely different conclusions. A reference to fig. 10 (Section 14 post ), where the curves given by different observers are plotted, shows that the latest form of the curve, which is the result of the researches of Callendar and Barnes, differs widely from the curves given by Regnault and by Lüdin. At 80° C. the values of the specific heat of water in terms of the 15° calorie are.

scholarly journals Topological patterns in two-dimensional gel electrophoresis of DNA knots

2015 ◽  
Vol 112 (40) ◽  
pp. E5471-E5477 ◽  
Author(s):  
Davide Michieletto ◽  
Davide Marenduzzo ◽  
Enzo Orlandini
Keyword(s):  
Physical Properties ◽  
Experimental Work ◽  
Gel Electrophoresis ◽  
Large Body ◽  
2D Electrophoresis ◽  
Topological Complexity ◽  
Two Dimensional ◽  
Two Dimensional Gel Electrophoresis ◽  
Theoretical Understanding ◽  
Straight Line

Gel electrophoresis is a powerful experimental method to probe the topology of DNA and other biopolymers. Although there is a large body of experimental work that allows us to accurately separate different topoisomers of a molecule, a full theoretical understanding of these experiments has not yet been achieved. Here we show that the mobility of DNA knots depends crucially and subtly on the physical properties of the gel and, in particular, on the presence of dangling ends. The topological interactions between these and DNA molecules can be described in terms of an “entanglement number” and yield a nonmonotonic mobility at moderate fields. Consequently, in 2D electrophoresis, gel bands display a characteristic arc pattern; this turns into a straight line when the density of dangling ends vanishes. We also provide a novel framework to accurately predict the shape of such arcs as a function of molecule length and topological complexity, which may be used to inform future experiments.

THE ENTHALPY-POROSITY METHOD WITH A RECTANGULAR SPECIFIC HEAT CURVE

2018 ◽  
Author(s):  
Wim Beyne ◽  
Bernd Ameel ◽  
Alvaro de Gracia ◽  
Gabriel Zsembinszki ◽  
Luisa F Cabeza ◽  
...  
Keyword(s):  
Specific Heat ◽  
Heat Curve

Experimental Study on the Specific Heat Capacity Measurement of Water-Based Al2O3-Cu Hybrid Nanofluid by using Differential Thermal Analysis Method

2019 ◽  
Vol 15 ◽  
Author(s):  
Andaç Batur Çolak ◽  
Oğuzhan Yıldız ◽  
Mustafa Bayrak ◽  
Ali Celen ◽  
Ahmet Selim Dalkılıç ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Thermophysical Properties ◽  
Volume Concentration ◽  
Pure Water ◽  
Heat Capacity Measurement ◽  
Experimental Results ◽  
Hybrid Nanofluid ◽  
Capacity Measurement

Background: Researchers working in the field of nanofluid have done many studies on the thermophysical properties of nanofluids. Among these studies, the number of studies on specific heat are rather limited. In the study of the heat transfer performance of nanofluids, it is necessary to increase the number of specific heat studies, whose subject is one of the important thermophysical properties. Objective: The authors aimed to measure the specific heat values of Al2O3/water, Cu/water nanofluids and Al2O3-Cu/water hybrid nanofluids using the DTA method, and compare the results with those frequently used in the literature. In addition, this study focuses on the effect of temperature and volume concentration on specific heat. Method: The two-step method was used in the preparation of nanofluids. The pure water selected as the base fluid was mixed with the Al2O3 and Cu nanoparticles and Arabic Gum as the surfactant, firstly mixed in the magnetic stirrer for half an hour. It was then homogenized for 6 hours in the ultrasonic homogenizer. Results: After the experiments, the specific heat of nanofluids and hybrid nanofluid were compared and the temperature and volume concentration of specific heat were investigated. Then, the experimental results obtained for all three fluids were compared with the two frequently used correlations in the literature. Conclusion: Specific heat capacity increased with increasing temperature, and decreased with increasing volume concentration for three tested nanofluids. Cu/water has the lowest specific heat capacity among all tested fluids. Experimental specific heat capacity measurement results are compared by using the models developed by Pak and Cho and Xuan and Roetzel. According to experimental results, these correlations can predict experimental results within the range of ±1%.

scholarly journals Toxicity Induced by Cytokines, Glucose, and Lipids Increase Apoptosis and Hamper Insulin Secretion in the 1.1E7 Beta Cell-Line

2021 ◽  
Vol 22 (5) ◽  
pp. 2559
Author(s):  
Antonia Diaz-Ganete ◽  
Aranzazu Quiroga-de-Castro ◽  
Rosa M. Mateos ◽  
Francisco Medina ◽  
Carmen Segundo ◽  
...  
Keyword(s):  
Insulin Secretion ◽  
Cell Line ◽  
High Glucose ◽  
Secretory Pathway ◽  
Early Stage ◽  
Hybrid Cell ◽  
Basic Research ◽  
Stress Markers ◽  
Beta Cell Line ◽  
Starting Point

Basic research on types 1 and 2 diabetes mellitus require early stage studies using beta cells or cell lines, ideally of human origin and with preserved insulin secretion in response to glucose. The 1.1E7 cells are a hybrid cell line resulting from the electrofusion of dispersed human islets and PANC-1 cells, capable of secreting insulin in response to glucose, but their survival and function under toxic conditions remains untested. This characterization is the purpose of the present study. We treated these cells with a cytokine mix, high glucose, palmitate, and the latter two combined. Under these conditions, we measured cell viability and apoptosis (MTT, Caspase Glo and TUNEL assays, as well as caspase-8 and -9 levels by Western blotting), endoplasmic reticulum stress markers (EIF2AK3, HSPA4, EIF2a, and HSPA5) by real-time PCR, and insulin secretion with a glucose challenge. All of these stimuli (i) induce apoptosis and ER stress markers expression, (ii) reduce mRNA amounts of 2–5 components of genes involved in the insulin secretory pathway, and (iii) abrogate the insulin release capability of 1.1E7 cells in response to glucose. The most pronounced effects were observed with cytokines and with palmitate and high glucose combined. This characterization may well serve as the starting point for those choosing this cell line for future basic research on certain aspects of diabetes.

Trauma-informed servant leadership in health and social care settings

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Daryl Mahon
Keyword(s):  
Servant Leadership ◽  
Conceptual Model ◽  
Social Care ◽  
Large Body ◽  
Well Being ◽  
Service Users ◽  
Content Type ◽  
Starting Point ◽  
Health And Social Care ◽  
Trauma Informed

Purpose Practitioners, organisations and policy makers in health and social care settings are increasingly recognising the need for trauma-informed approaches in organisational settings, with morbidity and financial burdens a growing concern over the past few years. Servant leadership has a unique focus on emotional healing, service to others as the first priority, in addition to the growth, well-being and personal and professional development of key stakeholders. This paper aims to discuss Trauma Informed Servant Leadership (TISL). Design/methodology/approach A targeted review of the servant leadership and trauma-informed care literature was conducted. Relevant studies, including systematic review and meta-analysis, were sourced, with the resulting interpretation informing the conceptual model. Findings Although there are general guidelines regarding how to go about instituting trauma-informed approaches, with calls for organisational leadership to adapt the often cited six trauma-informed principles, to date there has not been a leadership approach elucidated which takes as its starting point and core feature to be trauma informed. At the same time, there is a paucity of research elucidating trauma outcomes for service users or employees in the literature when a trauma-informed approach is used. However, there is a large body of evidence indicating that servant leadership has many of the outcomes at the employee level that trauma-informed approaches are attempting to attain. Thus, the author builds on a previous conceptual paper in which a model of servant leadership and servant leadership supervision are proposed to mitigate against compassion fatigue and secondary trauma in the health and social care sector. The author extends that research to this paper by recasting servant leadership as a trauma-informed model of leadership that naturally operationalises trauma-informed principles. Research limitations/implications A lack of primary data limits the extent to which conclusions can be drawn on the effectiveness of this conceptual model. However, the model is based on robust research across the differential components used; therefore, it can act as a framework for future empirical research designs to be studies at the organisational level. Both the servant leadership and trauma-informed literatures have been extended with the addition of this model. Practical implications TISL can complement the trauma-informed approach and may also be viable as an alternative to trauma-informed approaches. This paper offers guidelines to practitioners and organisations in health and social care on how to operationalise important trauma-informed principles through leadership. Social implications This conceptual model may help reduce the burden of trauma and re-traumatisation encountered by practitioners and service users in health and social care settings, impacting on morbidity. Originality/value To the best of the author’s knowledge, this is a novel approach, the first of its kind.

Adapted Methodology for Evaluating EOR Reserves and Resources, Incorporated and Applied at an Oil and Gas Company

2021 ◽  
Author(s):  
Lilibeth Chiquinquira Perdomo ◽  
Carlos Alvarez ◽  
Maria Edith Gracia ◽  
Guillermo Danilo Salomone ◽  
Gilberto Ventuirini ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Large Body ◽  
Securities And Exchange Commission ◽  
Point Of View ◽  
Assessment Process ◽  
Pilot Projects ◽  
Oil Reserves ◽  
Track Record ◽  
Starting Point ◽  
Petroleum Resources

Abstract As other companies registered in the US stock market, the company reports oil and gas reserves, in compliance with the definitions of the Securities and Exchange Commission (SEC). In addition, it complies internally with the guidelines established by the Petroleum Resources Management System to certify its resources. The PRMS focuses on supporting consistent evaluation of oil resources based on technically sound industry practices, providing fundamental principles for the assessment and classification of oil reserves and resources, but does not provide specific guidance for the classification and categorization of quantities associated with IOR projects. Recently, the company has implemented EOR pilot projects, and their results seem to show commerciality for future development or expansion to new areas, displaying multiple opportunities and proposals to incorporate reserves and resources. So far, the pilot projects and their expansions have been addressed only from the point of view of incremental projects, as an improvement over the previous secondary recovery. The company does not have sufficient track record in booking reserves or resources from EOR projects, their quantities have been incorporated following bibliographic references and results of EOR projects with proven commerciality around the world. For this reason, the need arose to have a tool that provides the company with methodological criteria to evaluate the resources and reserves inherent in this type of project, that incorporate the "best practices" of the industry and that respect the guidelines and definitions of PRMS for incremental projects. That was how, the need to meet this challenging goal led company to develop its "EOR Resources and Reserves Assessment Guide" with the advice of a renowned consulting company. Although the Guide is not intended to be a review of the large body of existing IOR literature, it contains several useful references that serve as a starting point for understanding the IOR project for assessment process of resources and reserves. This document shows the process of development and implementation of the EOR guide, complementing the existing guides within the corporation and providing the company with a positive result within the internal processes of Audit, reserves and resources for this type of projects.

scholarly journals Safeguarding information as an asset: Do we need a redefinition in the knowledge economy and beyond?

2016 ◽  
Vol 18 (1) ◽  
Author(s):  
Adeniji K. Adesemowo ◽  
Rossouw Von Solms ◽  
Reinhard A. Botha
Keyword(s):  
Internal Control ◽  
Knowledge Economy ◽  
Large Body ◽  
Research Approach ◽  
Significant Finding ◽  
Information Risk ◽  
Starting Point ◽  
Information Assets ◽  
Definition Of ◽  
Definition Of Information

Background: With the evolution of data, via information into knowledge and beyond, intangible information assets (seen as an integral part of IT assets in this article) increasingly come to fore. A contemporary issue facing organisations in the knowledge economy and beyond is how best to safeguard and derive optimum value from their evolving information assets. A well-known fact is that risk exists because there is the possibility of threats to an asset. Likewise, no assets equals no risk. Although a large body of work is addressing threat models, the nature of the assets of the knowledge economy and beyond has not been well researched.Objectives: To investigate the definition of information assets across a number of financial, risk and information technology standards, frameworks and regulations, in order to ascertain whether a coherent definition exists across the board. If there is none (or limited), then propose a workable definition that is apt for the knowledge economy and beyond.Method: Qualitative thematic content analysis and a comparative study based on four main themes (Assets, Types of Asset, Information, and Information Assets). This then serves as a basis for argumentation schemes that lead to a proposed re-definition. The qualitative research approach assists us to address the concern of the incoherent definition of information and information assets across the board.Results: Contrary to expectations, the research study found the current definition to be incoherent. When the asset to be controlled is not properly defined and understood, it stands the risk of not being identified properly. This implies that the effectiveness, efficiency, reliability of internal control, and compliance with the applicable legislation and regulations would not be appropriate. This article highlights the need for a fundamental shift in how information assets (valuable, but unvalued organisational intangible assets) are being viewed and treated, especially with regard to information risk and internal controls.Conclusion: This article has identified a major defect in most standards, frameworks, and regulations dealing with regard to the safeguarding and management of information assets (and IT assets). It has established from the review carried out that information assets have not been properly defined across the board. Beyond this significant finding, it was further shown that the principle of risk (assessment) across the board requires the identification of the asset that needs to be controlled. A starting point, then, is a coherent definition (as proposed) for the information asset in itself. Therefore, proper definition across the board might assists in proper identification that could result in appropriate control and graceful handling of the end-of-life disposal.Keywords: infonomics; information asset; information risk; internal control; reputation loss

scholarly journals The Thermal Properties of Sea Ice

1963 ◽  
Vol 4 (36) ◽  
pp. 789-807 ◽  
Author(s):  
Peter Schwerdtfecer
Keyword(s):  
Thermal Conductivity ◽  
Sea Ice ◽  
Physical Properties ◽  
Specific Heat ◽  
Energy Content ◽  
Air Bubbles ◽  
Solid Mixture ◽  
Latent Heats ◽  
Complex Substance ◽  
Ice Model

Abstract Compared with freshwater ice, whose physical properties are well known, sea ice is a relatively complex substance whose transition to a completely solid mixture of pure ice and solid salts is completed only at extremely low temperatures rarely encountered in nature. The physical properties of sea ice are thus strongly dependent on salinity, temperature and time. Many of these properties are still not fully understood or accurately known, particularly those important for the understanding of a natural ice cover. The specific heat for example is an important term in the calculation of the heat energy content of a cover. However, Malmgren (1927), whose calculated values of the specific heat of sea ice are in general use, neglected the direct contribution of the brine present in inclusions. Re-examination of the question of specific and latent heats of sea ice has led to distinguishing between the freezing and melting points and enabled significant observations in this range. Similarly, because the thermal conductivity is a necessary parameter in the description of the thermal behaviour of ice. the sea-ice model suggested by Anderson (1958) has been modified and extended in the present work to the case of saline ice containing air bubbles. This enabled the completion of calculations of density and conductivity. In order to illustrate the theoretically calculated values. measurements were made on sea-ice samples to determine the specific heat, density and thermal conductivity.

scholarly journals Partitioning Graph Drawings and Triangulated Simple Polygons into Greedily Routable Regions

2017 ◽  
Vol 27 (01n02) ◽  
pp. 121-158 ◽  
Author(s):  
Martin Nöllenburg ◽  
Roman Prutkin ◽  
Ignaz Rutter
Keyword(s):  
Routing Protocol ◽  
Graph Drawing ◽  
Geographic Routing ◽  
Np Hard ◽  
Line Drawings ◽  
Simple Polygons ◽  
Straight Line ◽  
Starting Point ◽  
Minimum Decomposition ◽  
Geographic Routing Protocol

A greedily routable region (GRR) is a closed subset of [Formula: see text], in which any destination point can be reached from any starting point by always moving in the direction with maximum reduction of the distance to the destination in each point of the path. Recently, Tan and Kermarrec proposed a geographic routing protocol for dense wireless sensor networks based on decomposing the network area into a small number of interior-disjoint GRRs. They showed that minimum decomposition is NP-hard for polygonal regions with holes. We consider minimum GRR decomposition for plane straight-line drawings of graphs. Here, GRRs coincide with self-approaching drawings of trees, a drawing style which has become a popular research topic in graph drawing. We show that minimum decomposition is still NP-hard for graphs with cycles and even for trees, but can be solved optimally for trees in polynomial time, if we allow only certain types of GRR contacts. Additionally, we give a 2-approximation for simple polygons, if a given triangulation has to be respected.

An anomaly in the specific heat below 3 °K of copper containing hydrogen

1969 ◽  
Vol 47 (14) ◽  
pp. 1485-1491 ◽  
Author(s):  
Neil Waterhouse
Keyword(s):  
Specific Heat ◽  
Molecular Hydrogen ◽  
Pure Copper ◽  
Solid Hydrogen ◽  
Rotational State ◽  
Experimental Results ◽  
Ortho Hydrogen ◽  
Temperature Range ◽  
A Value ◽  
Heat Curve

The specific heat of copper heated in hydrogen at 1040 °C has been measured over the temperature range 0.4 to 3.0 °K and found to be anomalous. The anomaly occurs in the same temperature range as the solid hydrogen λ anomaly which, in conjunction with evidence of ortho to para conversion of hydrogen in the sample, suggests the presence of molecular hydrogen in the copper. The anomaly reported by Martin for "as-received" American Smelting and Refining Company (ASARCO) 99.999+ % pure copper has been briefly compared with the present results. The form of the anomaly produced by the copper-hydrogen specimen has been compared with Schottky curves using the simplest possible model, that for two level splitting of the degenerate J = 1 rotational state of the ortho-hydrogen molecule.Maintenance of the copper-hydrogen sample at ~20 °K for approximately 1 week removed the "hump" in the specific heat curve. An equation of the form Cp = γT + (464.34/(θ0c)3)T3 was found to fit these experimental results and produced a value for γ which had increased over that for vacuumannealed pure copper by ~2%.

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